# Find minimum elevation along a polyline and return xy or point?

Using ArcGIS 10.1 and Python IDLE 2.7.2...

I'm trying to find the minimum value of a polyline with a raster layer and turn that LOCATION into a point. I put everything together in model builder, but the raster calculator doesn't like 32-bit floating points, which is what my DEM is. I tried to get around the raster calculator with the Con tool in python, but I believe an attribute table is required for this (which I don't have due to floating point). I could convert the DEM to integer and build one, but this is already a lengthy process that involves many scripts and tools and wanted to see if anyone else out there had any thoughts? I'm open to any anything, really, conversion of polyline to polygon, etc...attaching a screenshot of modelbuilder process that works, but I need a script as I am doing this 1000+ times.

I can turn the polyline into a 3D feature and find the minimum value, but I don't know how to find WHERE that minimum value is. If I could locate it with XY coordinates, I can then generate the point.

Thoughts? If I'm wrong about the Con tool and my syntax is wrong, that would be awesome, so please feel free to suggest something. It finds where the min is along the polyline that has been converted to raster and where that min is within the DEM, thus returning a min pixel:

tempRas1 = Con(Raster(LG_DEM_0_tif == LG_0_Zonalmin_img), LG_DEM_0_tif)

• try this (in arcpy): tempRas1 = Con(Raster(LG_DEM_0_tif) == Raster(LG_0_Zonalmin_img), LG_DEM_0_tif). In the raster calculator, you don't need to mention raster(), so Con(LG_DEM_0_tif == LG_0_Zonalmin_img , LG_DEM_0_tif) should work Commented Apr 17, 2014 at 7:40
• @radouxju, your syntax worked perfectly; just what I was looking for. Thank you! Commented Apr 17, 2014 at 15:20